Combination-furnace.



No. 688,358. Patented Dec. I0, |90I.

J. K. STEWART.

CUMBINATIN FURNACE.

(Application led' Feb. 12, 1900.)

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Pa'tgnted Dec. I0, |901.-

lo.. 688,358. l J. K. STEWART.

COIBINATIUN FURNAGE.

(Application Bled Feb. ,19, 1900.)

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UNITED STATES PATENT OFFICE- 1i JOHN K. STEVART, OF CHICAGO, ILLINOIS.

COMBINATION-FURNACE.

SPECIFICATION forming part of LetterspPatent No. 688,358, dated December10, 1901. l Application tiled February 12,1900. Serial No. 4,901. (Nomodel.)

vTo all whom t may concern:

Be it known that I, JOHN K. STEWART,a citizen of the United States,residing at Chicago, Cook county, State of Illinois, (having post- 5office address at No. 158 East Huron street,

Chicago, Cook county, Illinois,)'have invented certain new and usefulImprovements in Combination-Furnaces, which are fully set forth in thefollowing specification, reference being had to the accompanyingdrawings, forming a part thereof.

The purpose of this invention is to provide a combined apparatus orimplementin which the several forms of gas-furnaces required forspecific processes are assembled in one apparatus.

In the drawings, Figure 1 is a perspective of my combinedgasblast-furnace, the standards being partly broken away. Fig. 2 is alongitudinal vertical section. Fig. 3 is a top plan, partly in section,through the Cruciblefurnace at the'plane 3 3 on Fig. 2. y

I have shown in this implement or apparatus a muftle-furnace, a forge,and a cruciblefurnace all cornbinedin one integral shell, such shell andthe air-compressor and cornpressed-air reservoir for supplying theairblast to all three -furnaces being all assembled as a unitarystructure and supported on one base. I have also shown the gas`connections for supplying the gas to all the furnaces mounted andsupported on the same unitary structure,so that as a whole it requiresonly one gas connection to be made with any source of gas-supply and apower connection, such as a belt, to be extended to the air-compressorin order to be ready for operation at either or all of the furnaces.

A is the east-iron shell of my combined furnace, said shell comprisingfourwalls and bottom, and B is the top plate, which completes theinclosure of a single continuous chamber in said shell.

C represents the fire-clay or tire-brick lin,- ing of the shell. Thislining is extended to form the partitions C C2, which separate the threechambers Ca of the vmuliie-furnace, Cb of the forge, and Cc of theCrucible-furnace. Said lining is extended also overthe top to form thelining for the top plate B, having-the necessary apparatus, hereinafterdescribed, Jfor fluid-fuel supply and vent corresponding l with thepositions at which the fluid-fuel vconvenient position. I have shown twoburners or the double burner D D, mounted on the top plate B, forsupplying the muffle-furnace, for which vent-apertures b b are formedinthe top plate B, registering with corresponding apertures in the liningleading into the muflie-chamber. The burners E E are similarly mountedupon the top plate, while thc burners F 'F for the Crucible-furnace aremounted upon the back plate of the shell A. The interior contour of thelining of the muffle-chamber and the position of the burners andvent-ports with respect t o the cavity of the chamber are such that theflame is directed around the mnffle G, causing an even distribution ofVthe heat, avoiding conicting eddies and jet-s in the llame products ofcombustion and heat-currents. A similar result isobtained by theinterior contour of the forge-chamber, flame-ports from theburners E Ethrough the tire-clay lining being approximately tangential to thecurved inner surface of said lining, so that the flame is directed inthe manner to cause itto operate most effectively upon the metal exposedin such chamber. A similar relation between the contour in a horizontalplane of the inner wall of the lining of the crucible-chamber and thedirection of the llame-ports from the burners leading thereinto can beseen by reference to Fig. 3, resultingin a complete Hamemantle about thecrucible, giving au even distribution of heat thereto. TheCrucible-furnace of this unitary and integral structure is formed, asseen in Figs. l and 2, so that its top surface is a step below the topsurface of the remainder of the structure, the bottom being similarlydropped below the bottom of the other chamber, thus facilitating thehandlingvofthe Crucible, which must be lifted out of the chamber andwould be difiicult to manipulate if that chamber were on a level withthe others. The entire unitarystructure,

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able strength, which may be secured to the standards in a manner tobrace them' and increa-se the stability of` the entire structure. Thepressure-blower K for supplying compressed air for the blast is mountedupon the outer side of the standard H', the web of which issuitably/formed to accommodate the blower and afford means of securingit in position with itsintake and discharge pipes K' K2 at the upperside. From the dischargepipe K2 pipes extend to the reservoir .I and tothe mixers of the several burners.

L is a gassupply pipe which is suitably branched to su pply the severalburners,valves to control said burners separately being provided atsuitably-convenient points.

M is a vent-pipe from the Crucible-furnace.

I claiml. A combined furnace, comprising a unitarymetal shell inclosinga single continuous chamber and a fire-brick lining forsuch chamberextended to form vertical partitions therein continuous with saidlining, dividing the cavity into separate, non communicating chambers,and independent| burners for supplying Iluid fuel to said chambersrespectively.-

2. A combined furnace, comprising a unitary metal shell inclosing asingle continuous chamber,and a fire-brick lining forsnch chamberextended to form vertical partitions there, in continuous with saidliningand dividing` the cavity into separate chambers adaptedrespectively for a Crucible-chamber, a muiechamber and a forge-chamber;and independent burners for supplying fiuid fuel to said chambersrespectively.

3. A combined furnace,comprising a standard, a unitary metal shellmounted on and rigid with the standard and inclosing a single continuouschamber; a fire-brick lining for such chamber, extended to form verticalpartitions therein continuons with such 1ining and dividing the cavityinto separate noncommnnicating chambers; a compressed-air reservoir, anda compressor for supplying the same, mounted rigidly ou the standard andarranged to embrace the same; and independent Huid-fuel burners mountedon the metal shell connected with the com pressed-air reservoir,forheating the several chambers respectively.

In testimony whereof I have hereunto set my hand, in the presence of twowitnesses, at Chicago, Illinois, this 9th day of February,

JOHN K. STEWART. In presence of- CHAS. S. BURTON, ADNA H. BoWEN, Jr.

